Fountain-pen.



No. 826,552. PATBNTED JULY 24, 1905 (LDUNN.

FOUNTAIN PEN.

APPLICATION FILED JULY 3. 1905.

UNITED STATES PATENT oEEICE.

Specification of Letters Patent.

l Application filed July 3, 1905. Serial No. 268.033.

Pateted .my 24,1906.

To all whom it may concern:

Be it known that I, CHARLES DUNN, a citizen of the United States, and a resident of New York city, in the county of Kings and State of New York, have invented certain new and useful Improvements in Fountain- Pens, of which the following is a specification.

My invention relates to fountain-pens, and particularly to that class in which a piston is used to draw the reservoir of the device full of ink and becomes a part of the mechanism of the pen.

. The objects of my invention are to increase the ink-carrying -capacity ofa pen of this character, to reduce the weight and parts, and to provide means for keeping the piston tight in the reservoir and improved means W (reby the piston may be more easily operate My invention consists inthe details of construction whereby the above objects are attained.

Manufacturers of this class of pen use every effort to rovide a pen of a given diameter and lenfft of barrel with as large a reservoir as possible, and any change in construction which will give this result and not unduly increase the cost or number of parts is considered an advance and an advantage.

Referring to the drawings which form part of this specification, Figure l is a general view of the exterior of the pen when closed'. Fig. 2 is a central'sectional view of the device with the iston in position for drawinor the reservoir ll of ink. Fig. 3 is a centra sectional view with the parts in the position they normally occupy when the reservoir is full of ink and the pen ready for use. Fig. 4 is an enlarged view ofthe piston-holder shown in section. Fig. 5 is a cross-section on lines :c of Fie. 2. Fig. 6 is an end view of the key used for adjusting the diameter of the piston, and Fig. 7'is a side-view of the key.

a indicates the casing, b the pen-section, and b the penoint.

c is a screwe joint which holds the parts@ and b together.

d is the rear cap and is held to the part a, by a friction-joint at d.

e is the en-cap.

fis the piston; gthe adjustment-ring therefor h, the stem; the piston-holder, which is formed with a hollow center 'i'.

y' is the extension-rod, whichV is prpvided with a threaded end j at one end, which is adapted to engage wlth a thread formed on c2 is the reservoir for ink formed in the casing a.

The stem h is secured firmly to the pistonholder t' by a small pin m, which is driven through both stem and holder.

Referring to Fig. 4, the perforation in the end of the tube Vt is adapted to receive the end of the pin m to secure the stem h to the tube i. The pin is preferred to a screw for the reason that a screwed joint might be unscrewed by accident in connecting and disconnecting the extension-rod from the piston-holder. The stern h is provided at lts opposite end'with a screw thread. which engages with the adjusting-ring g, and said ring 1s provided with two small holes g and gifinto which the projections on the key Z (see Figs. 5 and 6) lit.

Referring to Fig. 4, the length of the extension-rod j measured from the pin 7c to the abutment :i3 is just long enough so that the pin 7c may be inserted when the abutment ja 1s against the end 'i3 of the piston-holder, so that the end of the threaded portion 7" extends beyond the end Z4 of the piston-holder. This pin c is for the purpose of preventing the screwed portion j from being unscrewed from the iston-holder i and effects this purpose by a utting the thread 'i2 when screwed to the position, as shown. x j

The pen is assembled as follows: The end of the extension-rod y' is screwed through the threaded end of the piston-holder at i2 and pin 7c inserted firmly in place, after which the threaded portion j is drawn into the space 't'. The stein h is then secured to the pistonholder by the pin m, and thepiston f is slipped thereon and secured by the adjustment-ring g being screwed onto the stem h, as shown. The piston and holder is then inserted in the casing c with the extension-rod j screwed into enga ement with the piston-holder i, as shown in ig. l, so that the end jg will extend througlrthe opening e and the piston may be drawn into the casing e a short distance and the piston further extended laterally to a tight fit after being inserted in the casing, by the key Z. This is an important' advantage, for the reason that the piston can be made to fit exactly tothe best adjustment and Wear can betaken up Without removing for carrying large orsmall pens, as may bedeaired, with the casing a, and am also' enabled.

two

the piston Jfrom the casing a. The pen-section' b 1s neXt screwed into place in casing a and the pen filled by inserting the end of the pen-section tinto the ink and t.L en drawing the piston-back to the position shown in' Fig.

8. The extension-rod j' is next unscrewed from its connection with tbe piston-holder and. telescoped Within the same, .as shown in Fig. 3, after which the rear cap d is attached with the pen-cap e in position as shown, and

vthe )en is then read foruse. f

e shouldere, iormed at the end of the casinga, prevents the Withdrawal of the piston from the rear end ofthe casinga, and the opening-a limits thedviameter'of the part jg, whichis vformed integral with the entensionrodfor the reason that if formed with a screw i `joint' it adds'another A part and also would bey "apt to become unscrewed in coupling and uncoupling the extension-rod. j from the pistoni' to use a pieton-,of the full diameter of the casv ling a, 'leaving the Walls thereof as light as possible, and the entire construction is such that the parts will not eeeily'beeome' deranged and may be operated 'with certainty and ease. Furthermore, the extension-rod will proceedto point out in the claim What I claim as new and desire to Patent:

' In a pen of the character described, a casing provided With an abutment at its rear end and integral therewith and an opening therethrough, a pen-section located at the opposite end of said casing, a piston-holder Jsecure by Letters cylindrical in form, 'an extension-rod provided With an enlarged end and' of greater length than said piston-holder, and providedl with a threaded end which is adapted to envagewith said piston-holder, an abutment located on the end of said extension-rod which .serves to prevent the extension-rod from withdrawing 'from the piston-holder at its rear end., a stem removably attached to said'piston-holder, a piston mounted thereon, and a disk connected to said stem to secure said piston in place; substantially as de scribed. A .Y

Signed at New York city, in the county of New York and State of'NeW York, this 29th day of June, A. D. 1905.

CHARLES DUNN.

Witnesses: FRANK M. ASHLEY,

Louis C. SCHWENSEM. 

